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Comparison GreenVision GV-N-I015/04 vs Dahua NVR2104-I

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GreenVision GV-N-I015/04
Dahua NVR2104-I
GreenVision GV-N-I015/04Dahua NVR2104-I
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Main
Perimeter protection. Line intersection detection. Recognition of a person in the frame. Definition of license plates. Identification of unusual sounds.
The registrar has the function of face recognition and intrusion detection in a certain area of the frame.
Typedigital NVRdigital NVR
Camera connection4 channels4 channels
Features
Features
PTZ
motion response
face recognition
mobile app
PTZ
motion response
face recognition
mobile app
Connectors
RCA audio input1
RCA audio output11
USB 2.022
HDMI11
Max. HDMI resolution3840x2160 (4K)
VGA11
LAN11
LAN speed1 Gbps100 Mbps
Video recording
Bandwidth50/64 Mbps80/60 Mbps
Video compression formatH.265+, H.265, H.264+, H.264H.264, H.265, Smart H.264+, Smart H.265+, MJPEG
Max. resolution (IP)8 MP (~3840x2160 px)4288x2848 px
Drives
Number of SATA11
Max. total capacity10 TB6 TB
General
Power supply12В12В
Power consumption4 W10 W
Operating temperature-10 °C ~ +50 °С-10 °C ~ +50 °С
Maximum humidity90 %93 %
ONVIF
CMS
Dimensions300x227x53 mm205x206x48 mm
Weight0.99 kg0.45 kg
Added to E-Catalogjuly 2023august 2020

RCA audio input

The number of RCA analogue audio inputs provided in the design of the registrar.

Inputs of this type are used to connect the audio signal from analogue cameras capable of capturing sound, as well as from separately made microphones. At the same time, the number of such inputs can correspond to the number of BNC video inputs, which allows each analogue camera to be supplemented with sound. However, there are models that have only one RCA input with several BNC inputs.

Max. HDMI resolution

Maximum HDMI resolution.

The maximum image resolution that can be output via HDMI to the screen of the connected video equipment (monitor, TV, etc.). The HDMI output on the DVR allows you to stream Full HD, 2K or 4K images for high quality multi-screen images.

LAN speed

The maximum data transfer rate supported by the DVR's LAN ports.

Note that for simple tasks, a rather modest by modern standards speed of 100 Mbps is often enough. However, high bandwidth ( 1 Gbps) not only simplifies the transfer of large amounts of data, but also helps to reduce lags and improve the overall quality of communication; and modern technologies make it possible to provide support for gigabit LAN even in fairly simple and inexpensive registrars.

Of course, in order to use all the features of the LAN, it is necessary that the devices connected to such ports also support the appropriate speeds.

Bandwidth

The maximum data stream in Mbit/s that the NVR is capable of processing when recording and displaying. The throughput parameter is specified as the maximum incoming/outgoing speed, or as the sum of incoming and outgoing streams (total throughput). It is calculated in such a way that the throughput exceeds the total flow of all IP cameras connected to the DVR, and another 25–30% is put in reserve for playing video or viewing it via network access.

Video compression format

Standards (codecs) used by the recorder to compress the recorded video.

This parameter is important when viewing recorded materials on another device — for example, a media centre, into which a "flash drive" with files from the recorder is inserted. For normal viewing, it is necessary that the player supports the appropriate codec — otherwise the video will be displayed with distortion or will not work at all. Technical details on various standards can be found in special sources.

Note that if you plan to view the materials on a computer, you can not pay much attention to this parameter: most modern operating systems have extensive built-in sets of codecs, and if you don’t have the right codec, you can easily find it on the Internet.

Max. resolution (IP)

The maximum supported resolution of IP cameras with which the NVR is technically capable of working (primarily recording). With rare exceptions, devices record in maximum resolution from all connected IP cameras. However, the limiting factor here is bandwidth (see the relevant paragraph) – depending on the shooting conditions, it may not be enough.

High resolution allows you to get a more detailed image in which fine details are better visible. On the other hand, such videos take up large amounts of disk space, and their support significantly affects the cost of the device.

Max. total capacity

The largest total storage capacity with which the recorder is able to work correctly. By default, it is indicated only for internal media with a SATA interface (see above), however, in some models, data is also provided separately for external devices connected via eSATA.

Note that the limit on the total capacity follows from the fact that each individual port has its own limit on the capacity of the drive. In this case, the maximum capacity is distributed equally between the ports. This should be taken into account when choosing drives for the registrar: for example, in a 32 TB model with 8 SATA connectors, the limit for each connector will be 32/8 = 4 TB. This means that installing two internal 8 TB disks in such a registrar will not work, although their total capacity will be less than the maximum.

Maximum humidity

The highest relative air humidity at which the recorder is able to operate for an unlimited time without failures and breakdowns.

High air humidity has a negative effect on electronics: moisture can settle on various parts, including current-carrying, cause corrosion, short circuits, etc. This does not happen immediately, short-term work in high humidity may not cause any trouble, but a long stay in such conditions is not recommended. However, in most modern recorders, the permissible humidity is quite high — about 90%; indoors, such conditions are very rare.
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